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10 Most Dangerous Viruses in Internet History.

Getting a computer virus has happened to many users in some fashion or another. To most, it is simply a mild inconvenience, requiring a cleanup and then installing that antivirus program that you’ve been meaning to install but never got around to. But in other cases, it can be a complete disaster, with your computer turning into a very expensive brick which which no amount of antivirus can protect.
In this list, we will highlight some of the worst and notorious computer viruses that have caused a lot of damage in real life. And since people usually equate general malware like worms and trojan horses as viruses, we’re including them as well. These malware have caused tremendous harm, amounting to billions of dollars and disrupting critical real life infrastructure. Here are the 10 most famous and malicious computer viruses.
Recommended Reading: 10 Signs Your PC Has Been Compromised

1. ILOVEYOU

The ILOVEYOU virus is considered one of the most virulent computer virus ever created and it’s not hard to see why. The virus managed to wreck havoc on computer systems all over the world, causing damages totaling in at an estimateof $10 billion. 10% of the world’s Internet-connected computers were believed to have been infected. It was so bad that governments and large corporations took their mailing system offline to prevent infection.
📷via BBC
The virus was created by two Filipino programers, Reonel Ramones and Onel de Guzman. What it did was use social engineering to get people to click on the attachment; in this case, a love confession. The attachment was actually a script that poses as a TXT file, due to Windows at the time hiding the actual extension of the file. Once clicked, it will send itself to everyone in the user’s mailing list and proceed to overwrite files with itself, making the computer unbootable. The two were never charged, as there were no laws about malware. This led to the enactment of the E-Commerce Law to address the problem.

2. Code Red

Code Red first surfaced on 2001 and was discovered by two eEye Digital Security employees. It was named Code Red because the the pair were drinking Code Red Mountain Dew at the time of discovery. The worm targeted computers with Microsoft IIS web server installed, exploiting a buffer overflow problem in the system. It leaves very little trace on the hard disk as it is able to run entirely on memory, with a size of 3,569 bytes. Once infected, it will proceed to make a hundred copies of itself but due to a bug in the programming, it will duplicate even more and ends up eating a lot of the systems resources.
📷via F-Secure
It will then launch a denial of service attack on several IP address, famous among them the website of the White House. It also allows backdoor access to the server, allowing for remote access to the machine. The most memorable symptom is the message it leaves behind on affected web pages, "Hacked By Chinese!", which has become a meme itself. A patch was later released and it was estimate that it caused $2 billion in lost productivity. A total of 1-2 million servers were affected, which is amazing when you consider there were 6 million IIS servers at the time.

3. Melissa

Named after an exotic dancer from Florida, it was created by David L. Smith in 1999. It started as an infected Word document that was posted up on the alt.sex usenet group, claiming to be a list of passwords for pornographic sites. This got people curious and when it was downloaded and opened, it would trigger the macro inside and unleash its payload. The virus will mail itself to the top 50 people in the user’s email address book and this caused an increase of email traffic, disrupting the email services of governments and corporations. It also sometimes corrupted documents by inserting a Simpsons reference into them.
📷via MSN Canada
Smith was eventually caught when they traced the Word document to him. The file was uploaded using a stolen AOL account and with their help, law enforcement was able to arrest him less than a week since the outbreak began.He cooperated with the FBI in capturing other virus creators, famous among them the creator of the Anna Kournikova virus. For his cooperation, he served only 20 months and paid a fine of $5000 of his 10 year sentence. The virus reportedly caused $80 million in damages.

4. Sasser

A Windows worm first discovered in 2004, it was created by computer science student Sven Jaschan, who also created the Netsky worm. While the payload itself may be seen as simply annoying (it slows down and crashes the computer, while making it hard to reset without cutting the power), the effects were incredibly disruptive, with millions of computers being infected, and important, critical infrastructure affected. The worm took advantage of a buffer overflow vulnerability in Local Security Authority Subsystem Service (LSASS), which controls the security policy of local accounts causing crashes to the computer. It will also use the system resources to propagate itself to other machines through the Internet and infect others automatically.
📷via HP
The effects of the virus were widespread as while the exploit was already patched, many computers haven’t updated. This led to more than a million infections, taking out critical infrastructures, such as airlines, news agencies, public transportation, hospitals, public transport, etc. Overall, the damage was estimated to have cost $18 billion. Jaschen was tried as a minor and received a 21 month suspended sentence.

5. Zeus

Zeus is a Trojan horse made to infect Windows computers so that it will perform various criminal tasks. The most common of these tasks are usually man-in-the-browser keylogging and form grabbing. The majority of computers were infected either through drive-by downloads or phishing scams. First identified in 2009, it managed to compromise thousands of FTP accounts and computers from large multinational corporations and banks such as Amazon, Oracle, Bank of America, Cisco, etc. Controllers of the Zeus botnet used it to steal the login credentials of social network, email and banking accounts.
📷via Abuse.ch
In the US alone, it was estimated that more than 1 million computers were infected, with 25% in the US. The entire operation was sophisticated, involving people from around the world to act as money mules to smuggle and transfer cash to the ringleaders in Eastern Europe. About $70 million were stolen and in possession of the ring. 100 people were arrested in connection of the operation. In late 2010, the creator of Zeus announced his retirement but many experts believe this to be false.

6. Conficker

Also known as Downup or Downadup, Conficker is a worm of unknown authorship for Windows that made its first appearance in 2008. The name comes form the English word, configure and a German pejorative.It infects computers using flaws in the OS to create a botnet. The malware was able to infect more than 9 millions computers all around the world, affecting governments, businesses and individuals. It was one of the largest known worm infections to ever surface causing an estimate damage of $9 billion.
📷via Wikipedia
The worm works by exploiting a network service vulnerability that was present and unpatched in Windows. Once infected, the worm will then reset account lockout policies, block access to Windows update and antivirus sites, turn off certain services and lock out user accounts among many. Then, it proceeds to install software that will turn the computer into a botnet slaveand scareware to scam money off the user. Microsoft later provided a fix and patch with many antivirus vendors providing updates to their definitions.

7. Stuxnet

Believed to have been created by the Israeli Defence Force together with the American Government, Stuxnet is an example of a virus created for the purpose of cyberwarfare, as it was intended to disrupt the nuclear efforts of the Iranians. It was estimated that Stuxnet has managed to ruin one fifth of Iran’s nuclear centrifuges and that nearly 60% of infections were concentrated in Iran.
📷via IEEE
The computer worm was designed to attack industrial Programmable Logic Controllers (PLC), which allows for automation of processes in machinery. It specifically aimed at those created by Siemens and was spread through infected USB drives. If the infected computer didn’t contain Siemens software, it would lay dormant and infect others in a limited fashion as to not give itself away. If the software is there, it will then proceed to alter the speed of the machinery, causing it to tear apart. Siemens eventually found a way to remove the malware from their software.

8. Mydoom

Surfacing in 2004, Mydoom was a worm for Windows that became one of the fastest spreading email worm since ILOVEYOU. The author is unknown and it is believed that the creator was paid to create it since it contains the text message, “andy; I’m just doing my job, nothing personal, sorry,”. It was named by McAfee employee Craig Schmugar, one of the people who had originally discovered it. ‘mydom’ was a line of text in the program’s code (my domain) and sensing this was going to be big, added ‘doom’ into it.
📷via Virus.Wikidot.com
The worm spreads itself by appearing as an email transmission error and contains an attachment of itself. Once executed, it will send itself to email addresses that are in a user’s address book and copies itself to any P2P program’s folder to propagate itself through that network. The payload itself is twofold: first it opens up a backdoor to allow remote access and second it launches a denial of service attack on the controversial SCO Group. It was believed that the worm was created to disrupt SCO due to conflict over ownership of some Linux code. It caused an estimate of $38.5 billion in damages and the worm is still active in some form today.

9. CryptoLocker

CryptoLocker is a form of Trojan horse ransomware targeted at computers running Windows. It uses several methods to spread itself, such as email, and once a computer is infected, it will proceed to encrypt certain files on the hard drive and any mounted storage connected to it with RSA public key cryptography. While it is easy enough to remove the malware from the computer, the files will still remain encrypted. The only way to unlock the files is to pay a ransom by a deadline. If the deadline is not met, the ransom will increase significantly or the decryption keys deleted. The ransom usually amount to $400 in prepaid cash or bitcoin.
📷via Bleepingcomputer.com
The ransom operation was eventually stopped when law enforcement agencies and security companies managed to take control part of the botnet operating CryptoLocker and Zeus. Evgeniy Bogachev, the ring leader, was charged and the encryption keys were released to the affected computers. From data collected from the raid, the number of infections is estimated to be 500,000, with the number of those who paid the ransom to be at 1.3%, amounting to $3 million.

10. Flashback

Though not as damaging as the rest of the malware on this list, this is one of the few Mac malware to have gain notoriety as it showed that Macs are not immune. The Trojan was first discovered in 2011 by antivirus company Intego as a fake Flash install. In its newer incarnation, a user simply needs to have Java enabled (which is likely the majority of us). It propagates itself by using compromised websites containing JavaScript code that will download the payload. Once installed, the Mac becomes part of a botnet of other infected Macs.
📷via CNET
The good news is that if it is infected, it is simply localized to that specific user’s account. The bad news is that more than 600,000 Macs were infected, including 274 Macs in the Cupertino area, the headquarters of Apple. Oracle published a fix for the exploit with Apple releasing an update to remove Flashback from people’s Mac. It is still out in the wild, with an estimate of 22,000 Macs still infected as of 2014.
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Subreddit Stats: CryptoCurrency top posts from 2016-06-07 to 2017-06-06 02:47 PDT

Period: 363.15 days
Submissions Comments
Total 999 15798
Rate (per day) 2.75 42.46
Unique Redditors 448 3925
Combined Score 39454 48727

Top Submitters' Top Submissions

  1. 5473 points, 127 submissions: CryptoCurrencyNews
    1. Russian President Vladimir Putin Discusses Using Ethereum with Vitalik Buterin (214 points, 52 comments)
    2. Suddenly Vladimir Putin Meets Vitalik Buterin, Endorses Ethereum (140 points, 16 comments)
    3. Japanese Airline Accepts Bitcoin As Cryptocurrency Fever Spreads Across the Region (139 points, 6 comments)
    4. Siacoin Value Reaches US$0.01 As Trading Volume Surpasses Ethereum (130 points, 88 comments)
    5. Coinbase Users Can Now Buy and Sell Litecoin (126 points, 44 comments)
    6. Leading Japanese ATM Manufacturer Oki Gets into Bitcoin ATM Business (111 points, 4 comments)
    7. Bitcoin to Be Accepted at 260,000 Stores in Japan by This Summer (110 points, 15 comments)
    8. Russia’s Central Bank Drafting Proposal to Classify Bitcoins as Digital Goods (109 points, 13 comments)
    9. Japan’s Bitpoint to Add Bitcoin Payments to 100,000+ Stores (105 points, 0 comments)
    10. The Japanese are Using Bitcoin More than Expected (101 points, 4 comments)
  2. 1226 points, 36 submissions: Coinosphere
    1. Bitcoin expected to become part of everyday life in the Caribbean within eighteen months as banks abandon the region (70 points, 11 comments)
    2. Marijuana now legal in eight more US States while vendors get more bitcoin options (63 points, 0 comments)
    3. Bitfinex hacked, halts trading, deposits, and withdrawals - 119,756 BTC lost so far with no insurance (61 points, 4 comments)
    4. Hacker holds San Francisco railway to ransom, demands 100 bitcoins (56 points, 8 comments)
    5. Santander says ‘Yes to bitcoin’ in Brazil (53 points, 3 comments)
    6. Ukraine to be the first government to integrate blockchain technology, targets corruption (53 points, 1 comment)
    7. 50% of all consumers would use bank alternatives, including bitcoin, as Bank irrelevance grows (50 points, 0 comments)
    8. South Korea plans national digital currency using a Blockchain (47 points, 7 comments)
    9. Hackers auction NSA cyber weapons for bitcoin (43 points, 2 comments)
    10. Seafile replaces Paypal with bitcoin after Paypal privacy shenanigans (43 points, 0 comments)
  3. 1109 points, 20 submissions: Lukovka
    1. The IRS is Due to Present its Digital Currency Strategy to Congress Next Week (152 points, 49 comments)
    2. Huobi is the First Chinese Cryptocurrency Exchange To Allow Ethereum Trading (105 points, 19 comments)
    3. Bitcoin jumps to fresh record near $1,900 amid increased political risk (103 points, 23 comments)
    4. Bitcoin Exchanges Kraken, Poloniex To Be Scrutinized For Possible Insider Trading, Manipulation (102 points, 52 comments)
    5. US National Security Advisor: Bitcoin Needs to Be Understood, Not Feared (85 points, 1 comment)
    6. The Price of Bitcoin Breached $2,000 (72 points, 8 comments)
    7. Bitcoin soars above $1,700 as market cap adds $1 billion in just 24 hours (69 points, 23 comments)
    8. Coinbase CEO Claims The Company Saw 40,000 User Registrations in one day (61 points, 11 comments)
    9. Bitcoin Isn’t Money, Rules US Judge in Money Laundering Case (53 points, 3 comments)
    10. Bitcoin Investors Switching to Other Cryptocurrencies Due to Rising Fees (50 points, 18 comments)
  4. 697 points, 5 submissions: backforwardlow
    1. Ripple was 100% premined. Stellar was 97% premined. (271 points, 163 comments)
    2. Dear noobs, if you ask for investment advice, people will tell you to invest in what they hold, even if it makes you poor. (258 points, 46 comments)
    3. Stop using Poloniex (104 points, 145 comments)
    4. Too much money is being thrown at risky unknown entities. (46 points, 83 comments)
    5. Madness - Stratris now has a higher marketcap than Dash and Monero and volume more than both combined. (18 points, 53 comments)
  5. 687 points, 8 submissions: AnythingForSuccess
    1. Shills these days...can't believe its so accurate (206 points, 18 comments)
    2. How Litecoin feels right now (136 points, 41 comments)
    3. Daily reminder to keep your wallets safe, a guy is about to get robbed of 70+ BTC (101 points, 13 comments)
    4. Bubble confirmed (93 points, 189 comments)
    5. Are we in a cryptobubble akin to dotcom bubble? (52 points, 79 comments)
    6. Daily reminder guys! (52 points, 20 comments)
    7. Thoughts on IOTA project? (28 points, 17 comments)
    8. Is there some detailed rebuttal to these worrying Ethereum issues? (19 points, 26 comments)
  6. 679 points, 20 submissions: helmsk
    1. Bitcoin Transactions Declared VAT-Exempt in Norway (86 points, 3 comments)
    2. Countdown: Bitcoin Will Be a Legal Method of Payment in Japan in Two Months (85 points, 2 comments)
    3. Zeronet Wants to Replace the Dark Web by Marrying Bitcoin to Bittorrent Over Tor (46 points, 3 comments)
    4. New Image Hosting Service Pays Thousands of Uploaders in Bitcoin (45 points, 4 comments)
    5. Central Bank of Nigeria Says ‘We Can’t Stop Bitcoin’ (43 points, 6 comments)
    6. Coinbase Exits as Hawaii Requires Bitcoin Companies to Hold Fiat Reserves (40 points, 7 comments)
    7. Europe Lays Out Roadmap to Restrict Payments in Cash and Cryptocurrencies (35 points, 1 comment)
    8. Polish Bitcoin Adoption Escalating with Strong Ecosystem (32 points, 1 comment)
    9. One of These 5 Hyperinflating Economies Could Adopt Bitcoin in 2017 (31 points, 6 comments)
    10. A Look At Bitcoin Bubbles, When Will the Next One Be? (25 points, 7 comments)
  7. 653 points, 24 submissions: e-ok
    1. Europe Will Have Power to Ban Blockchain Tech in January 2018 (54 points, 20 comments)
    2. Italy's Largest Taxi Fleet Accepts Bitcoin (44 points, 2 comments)
    3. Bitcoin Projects on Github Surpass 10,000 (41 points, 3 comments)
    4. Bitcoin Symbol Left Out of Unicode's Latest Version (41 points, 4 comments)
    5. Malta's Prime Minister Says Europe Should Become the Bitcoin Continent (37 points, 3 comments)
    6. SEC Rejects Rule Change for Bitcoin ETF (32 points, 0 comments)
    7. Bitcoin Price Poised for a Breakout, Technical Analysis Shows (29 points, 5 comments)
    8. ECB to EU: Tighter Regulations, Less Anonymity on Digital Currencies (29 points, 8 comments)
    9. China's Constant Bubbles Drive Investors to Bitcoin in Droves (27 points, 0 comments)
    10. Yuan Heading for Big Drop -€“ What China's Outflows Mean for Bitcoin (26 points, 1 comment)
  8. 632 points, 15 submissions: -bnc
    1. Japan's largest Forex market opens Bitcoin exchanges to overwhelming demand (170 points, 1 comment)
    2. EU Parliament states Virtual Currencies cannot be anonymous (68 points, 26 comments)
    3. Wells Fargo sued for suspending Bitfinex wire transfers (68 points, 2 comments)
    4. ShapeShift launches trustless asset portfolio platform, Prism (54 points, 18 comments)
    5. Coinify and Countr partnership brings Bitcoin payments to 3,000 merchants (43 points, 2 comments)
    6. Civic launches decentralized identity solution for all occasions (35 points, 3 comments)
    7. UASF - Bitcoin's emergency plan to enact SegWit (29 points, 4 comments)
    8. Lightning Network XCTx adoption ushers in a new era of cryptocurrency functionality (25 points, 1 comment)
    9. Brazil pilots Bitcoin solution for real estate registration (24 points, 4 comments)
    10. 21 launches Lists, for bitcoin powered ‘microconsulting’ (21 points, 1 comment)
  9. 619 points, 1 submission: throwaway23613
    1. I Just Became a Crypto Millionaire (619 points, 242 comments)
  10. 609 points, 9 submissions: TommyEconomics
    1. Cryptocurrency passes $100B in total market cap! (169 points, 13 comments)
    2. Bitcoin just dropped below 50% dominance for the first time ever. (138 points, 78 comments)
    3. Bitcoin dominance now at 59.7%, below 60% for the first time ever. (68 points, 25 comments)
    4. Altcoin market cap passes $10B for first time. (60 points, 35 comments)
    5. Total cryptocurrency market cap now exceeds $20B for the first time! (59 points, 8 comments)
    6. Cryptocurrency market cap passes $70B alongside Bitcoin passing $2000 (31 points, 3 comments)
    7. Search traffic for "Cryptocurrency" hits all-time high! (30 points, 0 comments)
    8. We just hit a $40 billion market cap for cryptocurrency, congrats everyone! (30 points, 15 comments)
    9. Made a video that explains Monero, and on the current market situation. Check it out and let me know what you think! (24 points, 5 comments)

Top Commenters

  1. CryptoInvestor (527 points, 49 comments)
  2. trancephorm (494 points, 135 comments)
  3. nugymmer (347 points, 157 comments)
  4. Metasaurus_Rex (297 points, 23 comments)
  5. undystains (257 points, 28 comments)
  6. backforwardlow (250 points, 57 comments)
  7. algar32 (237 points, 68 comments)
  8. Rxef3RxeX92QCNZ (225 points, 75 comments)
  9. xmr_lucifer (225 points, 39 comments)
  10. ohiomoonchild (222 points, 67 comments)
  11. CryptoMaximalist (202 points, 36 comments)
  12. KalpaX (201 points, 68 comments)
  13. antiprosynthesis (183 points, 70 comments)
  14. peacheswithpeaches (178 points, 26 comments)
  15. c_reddit_m (173 points, 80 comments)
  16. NateOnTheNet (172 points, 51 comments)
  17. disignore (168 points, 22 comments)
  18. Justtryme90 (164 points, 45 comments)
  19. kap_fallback (163 points, 23 comments)
  20. thedesertlynx (155 points, 62 comments)
  21. Darius510 (153 points, 49 comments)
  22. We_are_all_satoshi (153 points, 33 comments)
  23. _moto (151 points, 21 comments)
  24. MR_CHNYD (150 points, 55 comments)
  25. DeepSpace9er (148 points, 26 comments)

Top Submissions

  1. I Just Became a Crypto Millionaire by throwaway23613 (619 points, 242 comments)
  2. Cryptocurrency website starterpack by Luit03 (451 points, 31 comments)
  3. I believe we are safe now. by proce55or (443 points, 35 comments)
  4. The Tokes Platform releases 4/20 Newsletter outlining new developments: products, mobile app, and more... #420Blazetheblockchain by Cryptnition (308 points, 3 comments)
  5. MONERO EXPLAINED by cryptoKL (292 points, 71 comments)
  6. Visualization of Cryptocurrency Correlations by SNAP_Longterm (280 points, 49 comments)
  7. Ripple was 100% premined. Stellar was 97% premined. by backforwardlow (271 points, 163 comments)
  8. CryptoMarkets right now by sneaky_soy_sauce (270 points, 16 comments)
  9. A warning - I am about to buy by kriegsfuehrung (264 points, 62 comments)
  10. Dear noobs, if you ask for investment advice, people will tell you to invest in what they hold, even if it makes you poor. by backforwardlow (258 points, 46 comments)

Top Comments

  1. 211 points: Metasaurus_Rex's comment in $10K to invest - What to do?
  2. 132 points: disignore's comment in Cryptocurrency website starterpack
  3. 121 points: illSeeMyselfOutNowOk's comment in A warning - I am about to buy
  4. 107 points: undystains's comment in Ripple was 100% premined. Stellar was 97% premined.
  5. 103 points: imonlyherefortheeths's comment in Since I got into cryptocurrencies a week ago, that's my crypto app folder on iPhone - am I missing something?
  6. 97 points: madhattared's comment in I hate to be this guy but... we are in a huge bubble, hear me out
  7. 92 points: CharlieBaumhauser's comment in Ripple is a scam
  8. 87 points: kongclassic's comment in What are your alt coin trading strategies?
  9. 73 points: CryptoInvestor's comment in What is your cryptocurrency you follow and why?
  10. 73 points: CryptoInvestor's comment in Thoughts in general on $SC - Siacoin?
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